Tailoring the pore size and chemistry of ionic ultramicroporous polymers for trace sulfur dioxide capture with high capacity and selectivity

2020 ◽  
Author(s):  
Xian Suo ◽  
Ying Yu ◽  
Siheng Qian ◽  
Lin Zhou ◽  
Xili Cui ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Pore Size ◽  
High Capacity

Enhancing the electrode performance of Co3O4 through Co3O4@a-TiO2 core–shell microcubes with controllable pore size

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40899-40906 ◽  
Author(s):  
Yanting Chu ◽  
Jinkui Feng ◽  
Yitai Qian ◽  
Shenglin Xiong
Keyword(s):  
Pore Size ◽  
High Capacity ◽  
Electrochemical Activity ◽  
Good Stability ◽  
Core Shell ◽  
Solvent Ratio ◽  
Electrode Performance

Co3O4@a-TiO2 structures have been realized by adjusting the solvent ratio. The excellent electrochemical activity of the composite is due to the good stability of TiO2 shell, high capacity of Co3O4 core, and the optimized porous size.

scholarly journals Broadening the pore size of coal-based activated carbonviaa washing-free chem-physical activation method for high-capacity dye adsorption

RSC Advances ◽  
2018 ◽  
Vol 8 (26) ◽  
pp. 14488-14499 ◽  
Author(s):  
Longxin Li ◽  
Fei Sun ◽  
Jihui Gao ◽  
Lijie Wang ◽  
Xinxin Pi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Pore Size Distribution ◽  
Pore Size ◽  
High Capacity ◽  
Dye Adsorption ◽  
High Rate ◽  
Physical Activation ◽  
Size Distributions ◽  
Pore Size Distributions ◽  
New Type

Aiming to overcome the limitations of the narrow pore size distributions of traditional activated carbon, we demonstrate a new type of activated carbon with a broadened pore size distribution for high-rate and high-capacity aqueous dye adsorption.

Desulfurization Properties of Activated Carbon Fibers

2014 ◽  
Vol 9 (2) ◽  
pp. 155892501400900 ◽  
Author(s):  
Wei Liu ◽  
Sabit Adanur
Keyword(s):  
Activated Carbon ◽  
Sulfur Dioxide ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Carbon Fibers ◽  
Adsorption Rate ◽  
Carbon Powder ◽  
Activated Carbon Fibers ◽  
Breakthrough Capacity

Activated carbon fibers (ACFs) are one of the most promising adsorbents due to their outstanding properties, such as more exposed adsorption surface, narrower pore size distribution, fast adsorption rate and flexibility, in comparison with granular activated carbon and activated carbon powder. In this work, ACFs manufactured from various raw materials were studied and their pore structures and sulfur dioxide removal performance under dry and humid conditions were investigated. From the ACFs studied in this paper, larger surface area was found correspond to higher total pore volume and larger DA micropore diameter. In dry air, breakthrough capacity of ACFs with sulfur dioxide was found to be proportionately dependent on micropore ratio and pore size distribution. Although powdered activated carbon (PAC) showed higher breakthrough capacity, its adsorption rate was slower than ACFs due to the difference of the pore structure. The presence of water vapor in the air stream greatly increased SO2 adsorption capacities of ACFs but affected their utilization differently.

Dissolution and precipitation reactions during acidic fluid percolation through different limestone samples

2020 ◽  
Author(s):  
Linda Luquot
Keyword(s):  
Diffusion Coefficient ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Transport Properties ◽  
Size Distribution ◽  
High Capacity ◽  
Co2 Injection ◽  
Geometrical Parameters ◽  
Calcite Dissolution ◽  
Geological Formation

<p>CO2 sequestration in deep geological formation is considered an option to reduce CO2 emissions in the atmosphere. After injection, the CO2 will slowly dissolve into the pore water producing low pH fluids with a high capacity for dissolving carbonates. Limestone rock dissolution induces geometrical parameters changes such as porosity, pore size distribution, or tortuosity which may consequently modify transport properties (permeability, diffusion coefficient). Characterizing these changes is essential for modelling flow and CO2 transport during and after the CO2 injection. Indeed, these changes can affect the storage capacity and injectivity of the formation.</p><p>Very few published studies evaluate the transport properties changes (porosity, permeability, pore size distribution, diffusion coefficient) due to fluid-rock interactions (dissolution and/or precipitation).</p><p>Here we report experimental results from the injection of acidic fluids (some of them equilibrated with gypsum) into limestone core samples of 25.4 mm diameter and around 25 mm length. We studied two different limestone samples: one composed of 73% of calcite and 27% of quartz, and the second one of 100% of dolomite. Experiments were realized at room temperature. Before and after each acidic rock attack, we measure the sample porosity, the diffusion coefficient and the pore size distribution.</p><p>We also imaged the 3D pore network by X-ray microtomography to evaluate the same parameters. During percolation experiments, the permeability changes are recorded and chemical samples taken to evaluate calcite dissolution and gypsum precipitation. Several dissolution/precipitation-characterization cycles are performed on each sample in order to study the evolution and relation of the different parameters.</p><p>These experiments show different dissolution regimes depending of the fluid acidity and of the</p><p>limestone samples in particular the initial local heterogeneity, and pore size distribution.</p>

High Capacity Hydrogen Adsorption in Cu(II) Tetracarboxylate Framework Materials: The Role of Pore Size, Ligand Functionalization, and Exposed Metal Sites

2009 ◽  
Vol 131 (6) ◽  
pp. 2159-2171 ◽  
Author(s):  
Xiang Lin ◽  
Irvin Telepeni ◽  
Alexander J. Blake ◽  
Anne Dailly ◽  
Craig M. Brown ◽  
...  
Keyword(s):  
Pore Size ◽  
Hydrogen Adsorption ◽  
High Capacity ◽  
Framework Materials

scholarly journals Cooperative CO2 adsorption promotes high CO2 adsorption density over wide optimal nanopore range

2017 ◽  
Vol 36 (1-2) ◽  
pp. 625-639 ◽  
Author(s):  
Lei Chen ◽  
Takumi Watanabe ◽  
Hirofumi Kanoh ◽  
Kenji Hata ◽  
Tomonori Ohba
Keyword(s):  
Porous Media ◽  
Specific Surface ◽  
Pore Size ◽  
Co2 Adsorption ◽  
High Capacity ◽  
Potential Wells ◽  
Cylindrical Pore ◽  
Cooperative Adsorption ◽  
Wide Range ◽  
Adsorption Density

Separation of CO2 based on adsorption, absorption, and membrane techniques is a crucial technology necessary to address current global warming issues. Porous media are essential for all these approaches and understanding the nature of the porous structure is important for achieving highly efficient CO2 adsorption. Porous carbon is considered to be a suitable porous media for investigating the fundamental mechanisms of CO2 adsorption, because of its simple morphology and its availability in a wide range of well-defined pore sizes. In this study, we investigated the dependence of CO2 adsorption on pore structures such as pore size, volume, and specific surface area. We also studied slit-shaped and cylindrical pore morphologies based on activated carbon fibers of 0.6–1.7 nm and carbon nanotubes of 1–5 nm, respectively, with relatively uniform structures. Porous media with larger specific surface areas gave higher CO2 adsorption densities than those of media having larger pore volumes. Narrower pores gave higher adsorption densities because of deep adsorption potential wells. However, at a higher pressure CO2 adsorption densities increased again in nanopores including micropores and small mesopores. The optimal pore size ranges of CO2 adsorption in the slit-shaped and cylindrical carbon pores were 0.4–1.2 and 1.0–2.0 nm, respectively, although a high adsorption density was only expected for the narrow carbon nanopores from adsorption potentials. The wider nanopore ranges than expected nanopore ranges are reasonable when considering intermolecular interactions in addition to CO2–carbon pore interactions. Therefore, cooperative adsorption among CO2 in relatively narrow nanopores can allow for high density and high capacity adsorption.

High adsorption activated calcium silicate enabling high-capacity adsorption for sulfur dioxide

2020 ◽  
Vol 44 (27) ◽  
pp. 11879-11886
Author(s):  
Feng Wang ◽  
Yongfeng Zhang ◽  
Zhihui Mao
Keyword(s):  
Fly Ash ◽  
Sulfur Dioxide ◽  
Calcium Silicate ◽  
Porous Silica ◽  
High Capacity ◽  
High Porosity ◽  
High Adsorption ◽  
Adsorption Performance ◽  
Silicon Sources

Fly ash, with its abundant silicon sources and high porosity, is an excellent precursor of porous silica-based sorbents, which are the key to obtaining high SO2 adsorption performance.

scholarly journals Precise fabrication of porous polymer frameworks using rigid polyisocyanides as building blocks: from structural regulation to efficient iodine capture

2022 ◽  
Author(s):  
Xun-Hui Xu ◽  
Yan-Xiang Li ◽  
Li Zhou ◽  
Na Liu ◽  
Zong-Quan Wu
Keyword(s):  
Pore Size ◽  
High Efficiency ◽  
High Capacity ◽  
Building Blocks ◽  
Porous Polymer ◽  
Structural Regulation ◽  
Very High

Macroporous polymer frameworks with a tunable pore size were readily prepared using 4-arm rod-like polymers as building blocks. They showed excellent iodine capture performance with very high efficiency (1 minute) and high capacity (574%).

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